okay so yesterday I put a new choke on my bike and it ran great then like an hour later tried again and it wouldn't and it was backfiring blowing flames out of my exhaust I am no expert on bikes. drained the fuel got new fuel still didn't run. any ideas what it could be

 

When is it back fireing? On the run down just randomly? A little more info would be nice

 

Is the new choke shutting off properly? I'd check this first seeing as your problem started after renewing it!